Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9127d9a512fb40…

MALICIOUS

PDF

71.8 KB Created: 2021-03-03 02:29:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ffbe45888518407e5bc742d016b30804 SHA-1: ed1039fc79d8ec1b5d01c19d78eb1e2c9e20b2e4 SHA-256: af9127d9a512fb407cbfdde87f52fc31d5d582ac79763385fcec5de2d32f01b1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirm the nature of the attack as a lure to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://fokemale.ru/strik?utm_term=timex+ironman+battery+replacement+reset PDF link annotation
    • http://axecheat8.xyz/gujomolinuzubt61w.pdfIn PDF document text
    • http://topstop.site/crowded_house_band_2020yqyiy.pdfIn PDF document text
    • http://summ-green.fun/87468155128fbewf.pdfIn PDF document text
    • https://cdn.sqhk.co/fitamorigob/gfgcgfG/covid_19_pandemic_essay_500_words.pdfIn PDF document text
    • http://kprovk.xyz/how_to_keep_summer_infant_monitor_onoe7h3.pdfIn PDF document text
    • http://gawolesimavuvad.22web.org/dragon_age_origins_multiclass_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/dijabidasu/LHauhcx/39536220122.pdfIn PDF document text
    • https://cdn.sqhk.co/sujutowupolu/nrgcgiK/sense_v2_flip_clock_weather_pro.pdfIn PDF document text
    • http://7lessons.site/safety_videos_free_download0yk8r.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mufiwajonutewom.rf.gd/naseridasovetomeseduxox.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/52967951179.pdfIn PDF document text
    • http://zusunikumejimet.rf.gd/traffic_report_10_freeway_los_angeles.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/xuwuwefabitirenowunosole.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/thinkpad_t420_size.pdfIn PDF document text
    • http://wegoxoxajenugol.rf.gd/dna_genes_chromosomes_worksheet.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC72 5340 bytes
SHA-256: 010f9c242d1814343f6300aa6b1245f6d38d5c9234148a58a0965af6334f9821
font_01_sfnt_off0000ee88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE88 10536 bytes
SHA-256: 3dd0bc29840471ebc69ea54fd2397f78ad493081497d2b890c4d088f44d88f8e

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